I'm getting a couple of render warnings when I use SIBL with Maya 2013. The output window is saying "type conflict: "color1" is type color, "maya_multdiv" returns type vector".

I know this is more of a warning about value types being plugged into a different kind of input than an outright error but I am getting a few issues when rendering with the batch render just quitting half way through the render and even a blue screen once or twice. I'm not convinced the latter is related to SIBL but it hasn't happened with any other setup.

Also a quick question, is there a way of deleting SIBL from the scene that deletes all of the connections too? Just deleting it from the outliner leaves a lot of the under the hood stuff floating round that still affects the final render.

Yeah those are warning and shouldn't be much of an issue, Mental Ray integration in Maya has always been problematic with the kind of issues you are describing, I had a lot of this problems especially with the occlusion shader where at some point you have to restart Maya to be able to render again